Well Bob, hate to rain on your gourmand parade, but the calcs were not exactly right (at least the ones you gave me), and if we relied on aikido for our waistlines, we'd all be as round as a ball. Actually I think that with all the stopping and starting involved in aikido, that we are lucky to be burning the equivalent of a good 3.5 mile an hour walk. When I did my figures (none of the VO2 or whatever stuff), I came up with only around 300 calories an hour for a 140 pound woman! Depressing! Now, an hour of irimi nage ukemi is probably worth a big mac (or for veg heads like myself, a garden burger).